I disagree, it's the left that practices violence against those they can't convert. Di genova has nothing to fear except intellectual humiliation from the right.
If he had said, in my presence, that he was hoping to see my brother subjected to the same fate as those brave marines in Mogadishu I would have pummelled him then and there.
There is such a thing, in the legal traditions surrounding free speech, as "fighting words."
He has uttered them.